Fuse unit

Abstract

To provide a fuse unit which can reduce the number of components and can achieve a low cost.SOLUTION: In a fuse unit 1 including a bus bar 3 having a fusible body 13 fused by overcurrent, a resin part 5 covering the bus bar 3, and a cover 7 covering the fusible body 13, the resin part 5 is arranged while covering the fusible body 13 so as to have an exposure part 21 exposed to outside, and the cover 7 is assembled with the resin part 5 so as to cover the exposure part 21.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a fuse unit. [Background technology]

[0002] Conventionally, a fuse unit has been known that includes a bus bar having a fusible element that melts when an overcurrent occurs, a resin part that covers the bus bar, and a cover that covers the fusible element (see Patent Document 1). In this fuse unit, a pair of covers are disposed opposite each other with the fusible element between them, and are engaged with each other to cover the fusible element. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-47414 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a fuse unit such as that disclosed in Patent Document 1, a pair of covers for covering the fusible element is required, increasing the number of parts. Also, when molding the resin part covering the bus bar, the entire part of the bus bar where the fusible element is located needs to be exposed to the outside, which makes the mold structure complicated and increases costs.

[0005] The present invention has been made in view of the problems inherent in the conventional technology, and an object of the present invention is to provide a fuse unit that can reduce the number of parts and lower costs. [Means for solving the problem]

[0006] The fuse unit of this embodiment comprises a bus bar having a fusible element that melts when an overcurrent occurs, a resin part that covers the bus bar, and a cover that covers the fusible element, wherein the resin part is positioned in close contact with the fusible element while covering the fusible element so as to have an exposed part exposed to the outside, and the cover is assembled to the resin part so as to cover the exposed part. Effect of the Invention

[0007] According to the present invention, it is possible to provide a fuse unit that can reduce the number of parts and lower costs. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a perspective view of the fuse unit according to the embodiment. [Diagram 2] FIG. 2 is a perspective view of the fuse unit according to the embodiment. [Diagram 3] 2 is an enlarged perspective view of a main portion of the fuse unit according to the embodiment with the cover removed; FIG. [Figure 4] FIG. 2 is an enlarged cross-sectional view of a main portion of the fuse unit according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The fuse unit according to the present embodiment will be described in detail below with reference to the drawings. Note that the dimensional ratios in the drawings are exaggerated for the convenience of explanation and may differ from the actual ratios.

[0010] 1, the fuse unit 1 according to this embodiment is disposed, for example, between a battery (not shown) mounted on a vehicle and an electrical component (not shown). The battery and the electrical component are electrically connected via the fuse unit 1. When an overcurrent flows, the fuse unit 1 cuts off the supply of power from the battery to the electrical component to protect the electrical component.

[0011] Although not shown, the battery is formed, for example, in a rectangular parallelepiped shape, and is provided with battery posts protruding outward from the outer surface. Battery terminals are electrically connected to the battery posts. The fuse unit 1 is electrically connected to the battery terminals.

[0012] As shown in FIGS. 1 to 4, the fuse unit 1 includes a bus bar 3, a resin part 5, and a cover .

[0013] The bus bar 3 is made of a conductive material, and includes a terminal connection portion 9, a component connection portion 11, and a fusible element 13.

[0014] The terminal connection portion 9 has a hole formed penetrating the busbar 3. A stud bolt (not shown) provided on the battery terminal is inserted through the hole in the terminal connection portion 9. The terminal connection portion 9 electrically connects the busbar 3 to the battery via the battery terminal by fastening a nut (not shown) to the stud bolt of the battery terminal.

[0015] A plurality of component connection portions 11 (four in this example) are provided, each having a hole formed penetrating the bus bar 3. A stud bolt is inserted into the hole of each component connection portion 11 and disposed therein. For example, a terminal (not shown) provided at an end portion of an electric wire (not shown) electrically connected to an electric component is inserted into the stud bolt of the component connection portion 11, and the bus bar 3 and the electric component are electrically connected by fastening a nut. By electrically connecting the electric component to the component connection portion 11, the battery and the electric component are electrically connected via the bus bar 3.

[0016] A plurality of (four here) fusible elements 13 are provided on the bus bar 3 between the terminal connection portion 9 and the plurality of component connection portions 11. The fusible elements 13 melt when an overcurrent is input to the bus bar 3 during power supply from the battery to the electrical components. When the fusible elements 13 melt, the power supply from the battery to the electrical components is cut off, thereby protecting the electrical components.

[0017] The resin portion 5 is insert-molded using a molding die (not shown) so as to cover the periphery of the bus bar 3. The resin portion 5 includes a terminal resin portion 15, a component resin portion 17, and a fusible body resin portion 19.

[0018] Terminal resin portion 15 is provided for terminal connection portion 9 of bus bar 3. Terminal resin portion 15 is molded integrally with bus bar 3 so as to expose both surfaces near the periphery of the hole of terminal connection portion 9 to the outside and to cover the outer edge of terminal connection portion 9.

[0019] The component resin part 17 is provided for the component connection part 11 of the busbar 3. The component resin part 17 is molded integrally with the busbar 3 so as to expose one side near the periphery of the hole of the component connection part 11 to the outside and to cover the outer edge of the component connection part 11 and the base end side of the stud bolt. The component resin part 17 is molded to have partition walls that partition each of the multiple component connection parts 11.

[0020] The fusible body resin part 19 is provided for the fusible body 13 of the busbar 3. The fusible body resin part 19 is molded integrally with the busbar 3 so that one side of the busbar 3 near the fusible body 13 and an exposed part 21 of the fusible body 13 are exposed to the outside. The fusible body 13 arranged in the fusible body resin part 19 is molded integrally with the busbar 3 so that the resin part 5 is in close contact with the fusible body 13 and is covered by the resin part 5, except for the exposed part 21. The fusible body resin part 19 is molded to have partition walls that partition each of the multiple fusible bodies 13.

[0021] The fusible resin part 19 is molded integrally with the fusible body 13 so that the fusible body 13 has the exposed part 21, and therefore it is not necessary to provide a structure in the molding die for preventing the resin from flowing to the side opposite the exposed part 21 of the busbar 3 near the fusible body 13. This makes it possible to simplify the molding die and reduce costs. The fusible resin part 19 prevents the fusible body 13 from scattering when the fusible body 13 melts. The fusible resin part 19 covers the fusible body 13 so as to have the exposed part 21, so that the entire fusible body 13 is not covered by the resin part 5, and the state of the fusible body 13 can be visually confirmed from the outside. The partition walls on both sides located on the outermost sides of the fusible resin part 19 are each provided with a locking protrusion 23 with which the cover 7 is engaged.

[0022] The cover 7 is made of an insulating material such as synthetic resin and is formed to be transparent. The cover 7 is formed in a rectangular shape capable of collectively covering the openings in the plurality of fusible resin parts 19 where the exposed parts 21 of the fusible elements 13 are located. Elastically deformable locking pieces 25 that are engaged with the locking projections 23 are provided on both sides of the cover 7 in the longitudinal direction.

[0023] The cover 7 is assembled to the resin part 5 by engaging the locking pieces 25 with the locking projections 23, and covers the exposed parts 21 of the fusible elements 13. The cover 7 assembled to the resin part 5 prevents the fusible elements 13 from scattering when the fusible elements 13 melt. By having only one cover 7 assembled to the resin part 5, the number of parts can be reduced. The cover 7 is formed transparent, so the state of the fusible elements 13 can be visually confirmed from the outside without removing it from the resin part 5.

[0024] Such a fuse unit 1 includes a bus bar 3 having a fusible element 13 that melts due to an overcurrent, a resin part 5 that covers the bus bar 3, and a cover 7 that covers the fusible element 13. The resin part 5 is disposed in close contact with the fusible element 13 while covering the fusible element 13 so as to have an exposed part 21 that is exposed to the outside. The cover 7 is attached to the resin part 5 so as to cover the exposed part 21.

[0025] Since the resin part 5 covers the fusible element 13 so as to have the exposed part 21, there is no need to provide a structure in the molding die to prevent the resin from flowing to the side opposite the exposed part 21 of the busbar 3 near the fusible element 13. This makes it possible to simplify the molding die and reduce costs. In addition, the fusible element 13 is not entirely covered by the resin part 5, and the state of the fusible element 13 can be visually confirmed from the outside. Since the cover 7 is attached to the resin part 5 so as to cover the exposed part 21, it is possible to reduce the number of parts by using only one cover 7.

[0026] Therefore, in such a fuse unit 1, the number of parts can be reduced, and costs can be reduced.

[0027] Moreover, the cover 7 is formed to be transparent.

[0028] Therefore, the state of the fusible element 13 can be visually confirmed from the outside without removing the cover 7 from the resin portion 5.

[0029] Although the present embodiment has been described above, the present embodiment is not limited to this, and various modifications are possible within the scope of the gist of the present embodiment.

[0030] For example, four fusible elements are provided, but the number is not limited to this, and may be three or less, or five or more, as long as the fusible elements are provided in accordance with the electrical components to be electrically connected. [Explanation of symbols]

[0031] 1 Fuse unit 3 Bus bar 5 Resin part 7 Cover 13 Soluble 21 Exposed part

Claims

1. A bus bar having a fusible element that melts due to an overcurrent; A resin portion covering the bus bar; A cover for covering the fusible element; Equipped with the resin portion is disposed in close contact with the fusible element while covering the fusible element so as to have an exposed portion exposed to the outside, The cover is attached to the resin part so as to cover the exposed part of the fuse unit.

2. The fuse unit according to claim 1 , wherein the cover is transparent.

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